refactor(constants): create api_constants.py — centralize API path strings (#3531)

[mrveiss]

Summary

Creates autobot-backend/constants/api_constants.py and replaces all hardcoded /health, /api/health, and /api/generate path strings across 11 files.

New file: constants/api_constants.py

PATH_HEALTH          = "/health"
PATH_API_HEALTH      = "/api/health"
PATH_OLLAMA_GENERATE = "/api/generate"
PATH_OLLAMA_CHAT     = "/api/chat"
PATH_OLLAMA_TAGS     = "/api/tags"

Files updated

File	Change
constants/threshold_constants.py	Replaced inline string defs with imports from api_constants
middleware/service_auth_enforcement.py	EXEMPT_PATHS list entries
middleware/tracing_middleware.py	EXCLUDED_PATHS set entries
utils/service_registry.py	ServiceConfig default + 5 get_default_services() entries
utils/service_discovery.py	ServiceEndpoint default + 4 _register_* assignments
utils/hardware_metrics.py	One "path" dict entry
api/api_benchmarks.py	3 URL construction occurrences
chat_workflow/llm_handler.py	Ollama generate endpoint paths
agents/overseer/overseer_agent.py	3 occurrences in _get_ollama_endpoint()
agents/overseer/command_explanation_service.py	3 occurrences in _get_ollama_endpoint()
utils/connection_utils.py	.replace() call for tags discovery

Closes #3531

[github-actions]

✅ SSOT Configuration Compliance: Passing

🎉 No hardcoded values detected that have SSOT config equivalents!